Structure for double flying capacitor multicell converter; progressive double flying capacitor multicell converter

Afsharikhamaneh, Masoud; Abarzadeh, Mostafa; Ebrahimi, Jaber; Sojoudi, Tina; Farhadi, Payam

doi:10.1049/iet-pel.2014.0199

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…At the generic sampling instant t m the measured values of the armature currents, rotor speed and DC‐link voltages are the inputs of a full order stator flux observer [18]

\begin{matrix} right leftthickmathspace.5em \\ [\begin{matrix} 1em4pt \\ {\hat{i}}_{s} \\ {\hat{Φ}}_{s} \end{matrix}] & = [[\begin{matrix} a_{11} & a_{12} \\ a_{13} & 0 \end{matrix}] I + p ω_{r} [\begin{matrix} 1 & b_{12} \\ 0 & 0 \end{matrix}] Y] [\begin{matrix} 1em4pt \\ {\hat{i}}_{s} \\ {\hat{Φ}}_{s} \end{matrix}] \\ + [\begin{matrix} c_{1} \\ 0 \end{matrix}] I v_{s} + [[\begin{matrix} g_{1} \\ g_{2} \end{matrix}] I + p ω_{r} [\begin{matrix} g_{3} \\ g_{4} \end{matrix}] Y] ({\hat{i}}_{s} - i_{s}) \end{matrix}

where

\begin{matrix} right leftthickmathspace.5em \\ a_{11} & = - \frac{R_{s} + σ_{r} L_{s}}{σ_{s} L_{...}} \end{matrix}

…”

Section: Torque Derivative Controlmentioning

confidence: 99%

“…However, in multilevel converters the problem of capacitors voltages balancing leads to limitations in selecting the converter output voltage vector and suitable corrections are introduced in the control technique. The DC‐link unbalancing control strategy depends on the used converter topology: neutral point clamped (NPC) [16] or flying capacitor [17, 18]. Cascaded H‐bridge topologies are less susceptible to this aspect, because the DC‐link voltages are frequently sustained by arrays of electric storage elements such as batteries and/or supercapacitors [19].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Torque derivative control in induction motor drives supplied by multilevel inverters

Brando

Dannier

Pizzo

et al. 2016

IET Power Electronics

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The study deals with a novel torque derivative control of induction motor drives. The proposed technique is mainly finalised to improve the motor dynamic response regardless of speed operating conditions, ensuring satisfactory values of both motor currents distortion and torque ripple. The core of the discussed approach is a special look-up table, in which the converter voltage space vectors are sorted with respect to their influence on the torque derivative, taking also into account their influence on the flux magnitude. The table is indeed accessed by a desired torque derivative value, obtained by properly processing the output of hysteresis controllers. Moreover, a variable duty-cycle technique is implemented in order to ensure a satisfactory torque ripple in steady-state conditions. The proposed algorithm, suitable for a general multilevel inverter, is numerically tested on a three-level neutral point clamped inverter and its performance are compared with the ones obtained by a traditional direct torque control method based on three speed ranges look-up tables. The control is then validated experimentally by means of a reduced scale laboratory prototype fixing the same condition used for numerical analysis.

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“…At the generic sampling instant t m the measured values of the armature currents, rotor speed and DC‐link voltages are the inputs of a full order stator flux observer [18]